summaryrefslogtreecommitdiffstats
path: root/src/vnet/ip6-nd/rd_cp.h
blob: 2fe43da621b74af9ddb65391ecb789bd04193ef7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
/*
 * Copyright (c) 2018 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __RD_CP_H__
#define __RD_CP_H__

#include <vnet/ip6-nd/ip6_nd.h>

extern int rd_cp_set_address_autoconfig (u32 sw_if_index,
					 u8 enable,
					 u8 install_default_routes);

#endif

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
a id='n386' href='#n386'>386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
/*
 *------------------------------------------------------------------
 * socket_api.c
 *
 * Copyright (c) 2009 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/stat.h>

#include <vppinfra/byte_order.h>
#include <svm/ssvm.h>
#include <vlibmemory/api.h>

#include <vlibmemory/vl_memory_msg_enum.h>

#define vl_typedefs		/* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun

/* instantiate all the endian swap functions we know about */
#define vl_endianfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun

socket_main_t socket_main;

#define SOCK_API_REG_HANDLE_BIT (1<<31)

static u32
sock_api_registration_handle (vl_api_registration_t * regp)
{
  ASSERT (regp->vl_api_registration_pool_index < SOCK_API_REG_HANDLE_BIT);
  return regp->vl_api_registration_pool_index | SOCK_API_REG_HANDLE_BIT;
}

static u32
socket_api_registration_handle_to_index (u32 reg_index)
{
  return (reg_index & ~SOCK_API_REG_HANDLE_BIT);
}

u8
vl_socket_api_registration_handle_is_valid (u32 reg_handle)
{
  return ((reg_handle & SOCK_API_REG_HANDLE_BIT) != 0);
}

void
vl_sock_api_dump_clients (vlib_main_t * vm, api_main_t * am)
{
  vl_api_registration_t *reg;
  socket_main_t *sm = &socket_main;
  clib_file_t *f;

  /*
   * Must have at least one active client, not counting the
   * REGISTRATION_TYPE_SOCKET_LISTEN bind/accept socket
   */
  if (pool_elts (sm->registration_pool) < 2)
    return;

  vlib_cli_output (vm, "Socket clients");
  vlib_cli_output (vm, "%20s %8s", "Name", "Fildesc");
    /* *INDENT-OFF* */
    pool_foreach (reg, sm->registration_pool,
    ({
        if (reg->registration_type == REGISTRATION_TYPE_SOCKET_SERVER) {
            f = vl_api_registration_file (reg);
            vlib_cli_output (vm, "%20s %8d", reg->name, f->file_descriptor);
        }
    }));
/* *INDENT-ON* */
}

vl_api_registration_t *
vl_socket_api_client_handle_to_registration (u32 handle)
{
  socket_main_t *sm = &socket_main;
  u32 index = socket_api_registration_handle_to_index (handle);
  if (pool_is_free_index (sm->registration_pool, index))
    {
#if DEBUG > 2
      clib_warning ("Invalid index %d\n", index);
#endif
      return 0;
    }
  return pool_elt_at_index (sm->registration_pool, index);
}

void
vl_socket_api_send (vl_api_registration_t * rp, u8 * elem)
{
#if CLIB_DEBUG > 1
  u32 output_length;
#endif
  socket_main_t *sm = &socket_main;
  u16 msg_id = ntohs (*(u16 *) elem);
  api_main_t *am = vlibapi_get_main ();
  msgbuf_t *mb = (msgbuf_t *) (elem - offsetof (msgbuf_t, data));
  vl_api_registration_t *sock_rp;
  clib_file_main_t *fm = &file_main;
  clib_error_t *error;
  clib_file_t *cf;

  cf = vl_api_registration_file (rp);
  ASSERT (rp->registration_type > REGISTRATION_TYPE_SHMEM);

  if (msg_id >= vec_len (am->api_trace_cfg))
    {
      clib_warning ("id out of range: %d", msg_id);
      vl_msg_api_free ((void *) elem);
      return;
    }

  sock_rp = pool_elt_at_index (sm->registration_pool,
			       rp->vl_api_registration_pool_index);
  ASSERT (sock_rp);

  /* Add the msgbuf_t to the output vector */
  vec_add (sock_rp->output_vector, (u8 *) mb, sizeof (*mb));

  /* Try to send the message and save any error like
   * we do in the input epoll loop */
  vec_add (sock_rp->output_vector, elem, ntohl (mb->data_len));
  error = clib_file_write (cf);
  unix_save_error (&unix_main, error);

  /* If we didn't finish sending everything, wait for tx space */
  if (vec_len (sock_rp->output_vector) > 0
      && !(cf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE))
    {
      cf->flags |= UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      fm->file_update (cf, UNIX_FILE_UPDATE_MODIFY);
    }

#if CLIB_DEBUG > 1
  output_length = sizeof (*mb) + ntohl (mb->data_len);
  clib_warning ("wrote %u bytes to fd %d", output_length,
		cf->file_descriptor);
#endif

  vl_msg_api_free ((void *) elem);
}

void
vl_socket_free_registration_index (u32 pool_index)
{
  int i;
  vl_api_registration_t *rp;
  void vl_api_call_reaper_functions (u32 client_index);

  if (pool_is_free_index (socket_main.registration_pool, pool_index))
    {
      clib_warning ("main pool index %d already free", pool_index);
      return;
    }
  rp = pool_elt_at_index (socket_main.registration_pool, pool_index);

  vl_api_call_reaper_functions (pool_index);

  ASSERT (rp->registration_type != REGISTRATION_TYPE_FREE);
  for (i = 0; i < vec_len (rp->additional_fds_to_close); i++)
    if (close (rp->additional_fds_to_close[i]) < 0)
      clib_unix_warning ("close");
  vec_free (rp->additional_fds_to_close);
  vec_free (rp->name);
  vec_free (rp->unprocessed_input);
  vec_free (rp->output_vector);
  rp->registration_type = REGISTRATION_TYPE_FREE;
  pool_put (socket_main.registration_pool, rp);
}

void
vl_socket_process_api_msg (vl_api_registration_t * rp, i8 * input_v)
{
  msgbuf_t *mbp = (msgbuf_t *) input_v;

  u8 *the_msg = (u8 *) (mbp->data);
  socket_main.current_rp = rp;
  vl_msg_api_socket_handler (the_msg);
  socket_main.current_rp = 0;
}

/*
 * Read function for API socket.
 *
 * Read data from socket, invoke SOCKET_READ_EVENT
 * for each fully read API message, return 0.
 * Store incomplete data for next invocation to continue.
 *
 * On severe read error, the file is closed.
 *
 * As reading is single threaded,
 * socket_main.input_buffer is used temporarily.
 * Even its length is modified, but always restored before return.
 *
 * Incomplete data is copied into a vector,
 * pointer saved in registration's unprocessed_input.
 */
clib_error_t *
vl_socket_read_ready (clib_file_t * uf)
{
  clib_file_main_t *fm = &file_main;
  vlib_main_t *vm = vlib_get_main ();
  vl_api_registration_t *rp;
  /* n is the size of data read to input_buffer */
  int n;
  /* msg_buffer vector can point to input_buffer or unprocessed_input */
  i8 *msg_buffer = 0;
  /* data_for_process is a vector containing one full message, incl msgbuf_t */
  u8 *data_for_process;
  /* msgbuf_len is the size of one message, including sizeof (msgbuf_t) */
  u32 msgbuf_len;
  u32 save_input_buffer_length = vec_len (socket_main.input_buffer);
  vl_socket_args_for_process_t *a;
  u32 reg_index = uf->private_data;

  rp = vl_socket_get_registration (reg_index);

  /* Ignore unprocessed_input for now, n describes input_buffer for now. */
  n = read (uf->file_descriptor, socket_main.input_buffer,
	    vec_len (socket_main.input_buffer));

  if (n <= 0)
    {
      if (errno != EAGAIN)
	{
	  /* Severe error, close the file. */
	  clib_file_del (fm, uf);
	  vl_socket_free_registration_index (reg_index);
	}
      /* EAGAIN means we do not close the file, but no data to process anyway. */
      return 0;
    }

  /* Fake smaller length teporarily, so input_buffer can be used as msg_buffer. */
  _vec_len (socket_main.input_buffer) = n;

  /*
   * Look for bugs here. This code is tricky because
   * data read from a stream socket does not honor message
   * boundaries. In the case of a long message (>4K bytes)
   * we have to do (at least) 2 reads, etc.
   */
  /* Determine msg_buffer. */
  if (vec_len (rp->unprocessed_input))
    {
      vec_append (rp->unprocessed_input, socket_main.input_buffer);
      msg_buffer = rp->unprocessed_input;
    }
  else
    {
      msg_buffer = socket_main.input_buffer;
    }
  /* Loop to process any full messages. */
  ASSERT (vec_len (msg_buffer) > 0);
  do
    {
      /* Here, we are not sure how big a chunk of message we have left. */
      /* Do we at least know how big the full message will be? */
      if (vec_len (msg_buffer) <= sizeof (msgbuf_t))
	/* No, so fragment is not a full message. */
	goto save_and_split;

      /* Now we know how big the full message will be. */
      msgbuf_len =
	ntohl (((msgbuf_t *) msg_buffer)->data_len) + sizeof (msgbuf_t);

      /* But do we have a full message? */
      if (msgbuf_len > vec_len (msg_buffer))
	{
	save_and_split:
	  /* We don't have the entire message yet. */
	  /* If msg_buffer is unprocessed_input, nothing needs to be done. */
	  if (msg_buffer == socket_main.input_buffer)
	    /* But if we were using the input buffer, save the fragment. */
	    {
	      ASSERT (vec_len (rp->unprocessed_input) == 0);
	      vec_validate (rp->unprocessed_input, vec_len (msg_buffer) - 1);
	      clib_memcpy_fast (rp->unprocessed_input, msg_buffer,
				vec_len (msg_buffer));
	      _vec_len (rp->unprocessed_input) = vec_len (msg_buffer);
	    }
	  /* No more full messages, restore original input_buffer length. */
	  _vec_len (socket_main.input_buffer) = save_input_buffer_length;
	  return 0;
	}

      /*
       * We have at least one full message.
       * But msg_buffer can contain more data, so copy one message data
       * so we can overwrite its length to what single message has.
       */
      data_for_process = (u8 *) vec_dup (msg_buffer);
      _vec_len (data_for_process) = msgbuf_len;
      /* Everything is ready to signal the SOCKET_READ_EVENT. */
      pool_get (socket_main.process_args, a);
      a->reg_index = reg_index;
      a->data = data_for_process;

      vlib_process_signal_event (vm, vl_api_clnt_node.index,
				 SOCKET_READ_EVENT,
				 a - socket_main.process_args);
      if (vec_len (msg_buffer) > msgbuf_len)
	/* There are some fragments left. Shrink the msg_buffer to simplify logic. */
	vec_delete (msg_buffer, msgbuf_len, 0);
      else
	/* We are done with msg_buffer. */
	_vec_len (msg_buffer) = 0;
    }
  while (vec_len (msg_buffer) > 0);

  /* Restore input_buffer, it could have been msg_buffer. */
  _vec_len (socket_main.input_buffer) = save_input_buffer_length;
  return 0;
}

clib_error_t *
vl_socket_write_ready (clib_file_t * uf)
{
  clib_file_main_t *fm = &file_main;
  vl_api_registration_t *rp;
  int n;

  rp = pool_elt_at_index (socket_main.registration_pool, uf->private_data);

  /* Flush output vector. */
  size_t total_bytes = vec_len (rp->output_vector);
  size_t bytes_to_send, remaining_bytes = total_bytes;
  void *p = rp->output_vector;
  while (remaining_bytes > 0)
    {
      bytes_to_send = remaining_bytes > 4096 ? 4096 : remaining_bytes;
      n = write (uf->file_descriptor, p, bytes_to_send);
      if (n < 0)
	{
	  if (errno == EAGAIN)
	    {
	      break;
	    }
#if DEBUG > 2
	  clib_warning ("write error, close the file...\n");
#endif
	  clib_file_del (fm, uf);
	  vl_socket_free_registration_index (rp -
					     socket_main.registration_pool);
	  return 0;
	}
      remaining_bytes -= bytes_to_send;
      p += bytes_to_send;
    }

  vec_delete (rp->output_vector, total_bytes - remaining_bytes, 0);
  if (vec_len (rp->output_vector) <= 0
      && (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE))
    {
      uf->flags &= ~UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      fm->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
    }

  return 0;
}

clib_error_t *
vl_socket_error_ready (clib_file_t * uf)
{
  vl_api_registration_t *rp;
  clib_file_main_t *fm = &file_main;

  rp = pool_elt_at_index (socket_main.registration_pool, uf->private_data);
  clib_file_del (fm, uf);
  vl_socket_free_registration_index (rp - socket_main.registration_pool);

  return 0;
}

void
socksvr_file_add (clib_file_main_t * fm, int fd)
{
  vl_api_registration_t *rp;
  clib_file_t template = { 0 };

  pool_get (socket_main.registration_pool, rp);
  clib_memset (rp, 0, sizeof (*rp));

  template.read_function = vl_socket_read_ready;
  template.write_function = vl_socket_write_ready;
  template.error_function = vl_socket_error_ready;
  template.file_descriptor = fd;
  template.private_data = rp - socket_main.registration_pool;

  rp->registration_type = REGISTRATION_TYPE_SOCKET_SERVER;
  rp->vl_api_registration_pool_index = rp - socket_main.registration_pool;
  rp->clib_file_index = clib_file_add (fm, &template);
}

static clib_error_t *
socksvr_accept_ready (clib_file_t * uf)
{
  clib_file_main_t *fm = &file_main;
  socket_main_t *sm = &socket_main;
  clib_socket_t *sock = &sm->socksvr_listen_socket;
  clib_socket_t client;
  clib_error_t *error;

  error = clib_socket_accept (sock, &client);
  if (error)
    return error;

  socksvr_file_add (fm, client.fd);
  return 0;
}

static clib_error_t *
socksvr_bogus_write (clib_file_t * uf)
{
  clib_warning ("why am I here?");
  return 0;
}

/*
 * vl_api_sockclnt_create_t_handler
 */
void
vl_api_sockclnt_create_t_handler (vl_api_sockclnt_create_t * mp)
{
  vl_api_registration_t *regp;
  vl_api_sockclnt_create_reply_t *rp;
  api_main_t *am = vlibapi_get_main ();
  hash_pair_t *hp;
  int rv = 0;
  u32 nmsg = hash_elts (am->msg_index_by_name_and_crc);
  u32 i = 0;

  regp = socket_main.current_rp;

  ASSERT (regp->registration_type == REGISTRATION_TYPE_SOCKET_SERVER);

  regp->name = format (0, "%s%c", mp->name, 0);

  u32 size = sizeof (*rp) + (nmsg * sizeof (vl_api_message_table_entry_t));
  rp = vl_msg_api_alloc_zero (size);
  rp->_vl_msg_id = htons (VL_API_SOCKCLNT_CREATE_REPLY);
  rp->index = htonl (sock_api_registration_handle (regp));
  rp->context = mp->context;
  rp->response = htonl (rv);
  rp->count = htons (nmsg);

  /* *INDENT-OFF* */
  hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
  ({
    rp->message_table[i].index = htons(hp->value[0]);
    (void) strncpy_s((char *)rp->message_table[i].name,
                     64 /* bytes of space at dst */,
                     (char *)hp->key,
                     64-1 /* chars to copy, without zero byte. */);
    i++;
  }));
  /* *INDENT-ON* */
  vl_api_send_msg (regp, (u8 *) rp);
}

/*
 * vl_api_sockclnt_delete_t_handler
 */
void
vl_api_sockclnt_delete_t_handler (vl_api_sockclnt_delete_t * mp)
{
  vl_api_registration_t *regp;
  vl_api_sockclnt_delete_reply_t *rp;

  regp = vl_api_client_index_to_registration (mp->client_index);
  if (!regp)
    return;

  u32 reg_index = socket_api_registration_handle_to_index (ntohl (mp->index));
  rp = vl_msg_api_alloc (sizeof (*rp));
  rp->_vl_msg_id = htons (VL_API_SOCKCLNT_DELETE_REPLY);
  rp->context = mp->context;

  if (!pool_is_free_index (socket_main.registration_pool, reg_index))
    {
      rp->response = htonl (1);
      vl_api_send_msg (regp, (u8 *) rp);

      vl_api_registration_del_file (regp);
      vl_socket_free_registration_index (reg_index);
    }
  else
    {
      clib_warning ("unknown client ID %d", reg_index);
      rp->response = htonl (-1);
      vl_api_send_msg (regp, (u8 *) rp);
    }
}

clib_error_t *
vl_sock_api_send_fd_msg (int socket_fd, int fds[], int n_fds)
{
  struct msghdr mh = { 0 };
  struct iovec iov[1];
  char ctl[CMSG_SPACE (sizeof (int) * n_fds)];
  struct cmsghdr *cmsg;
  char *msg = "fdmsg";
  int rv;

  iov[0].iov_base = msg;
  iov[0].iov_len = strlen (msg);
  mh.msg_iov = iov;
  mh.msg_iovlen = 1;

  clib_memset (&ctl, 0, sizeof (ctl));
  mh.msg_control = ctl;
  mh.msg_controllen = sizeof (ctl);
  cmsg = CMSG_FIRSTHDR (&mh);
  cmsg->cmsg_len = CMSG_LEN (sizeof (int) * n_fds);
  cmsg->cmsg_level = SOL_SOCKET;
  cmsg->cmsg_type = SCM_RIGHTS;
  clib_memcpy_fast (CMSG_DATA (cmsg), fds, sizeof (int) * n_fds);

  while ((rv = sendmsg (socket_fd, &mh, 0)) < 0 && errno == EAGAIN)
    ;
  if (rv < 0)
    return clib_error_return_unix (0, "sendmsg");
  return 0;
}

vl_api_shm_elem_config_t *
vl_api_make_shm_config (vl_api_sock_init_shm_t * mp)
{
  vl_api_shm_elem_config_t *config = 0, *c;
  u64 cfg;
  int i;

  if (!mp->nitems)
    {
      vec_validate (config, 6);
      config[0].type = VL_API_VLIB_RING;
      config[0].size = 256;
      config[0].count = 32;

      config[1].type = VL_API_VLIB_RING;
      config[1].size = 1024;
      config[1].count = 16;

      config[2].type = VL_API_VLIB_RING;
      config[2].size = 4096;
      config[2].count = 2;

      config[3].type = VL_API_CLIENT_RING;
      config[3].size = 256;
      config[3].count = 32;

      config[4].type = VL_API_CLIENT_RING;
      config[4].size = 1024;
      config[4].count = 16;

      config[5].type = VL_API_CLIENT_RING;
      config[5].size = 4096;
      config[5].count = 2;

      config[6].type = VL_API_QUEUE;
      config[6].count = 128;
      config[6].size = sizeof (uword);
    }
  else
    {
      vec_validate (config, mp->nitems - 1);
      for (i = 0; i < mp->nitems; i++)
	{
	  cfg = mp->configs[i];
	  /* Pretty much a hack but it avoids defining our own api type
	   * in memclnt.api */
	  c = (vl_api_shm_elem_config_t *) & cfg;
	  config[i].type = c->type;
	  config[i].count = c->count;
	  config[i].size = c->size;
	}
    }
  return config;
}

/*
 * Bootstrap shm api using the socket api
 */
void
vl_api_sock_init_shm_t_handler (vl_api_sock_init_shm_t * mp)
{
  vl_api_sock_init_shm_reply_t *rmp;
  ssvm_private_t _memfd_private, *memfd = &_memfd_private;
  svm_map_region_args_t _args, *a = &_args;
  vl_api_registration_t *regp;
  api_main_t *am = vlibapi_get_main ();
  svm_region_t *vlib_rp;
  clib_file_t *cf;
  vl_api_shm_elem_config_t *config = 0;
  vl_shmem_hdr_t *shmem_hdr;
  int rv, tries = 1000;

  regp = vl_api_client_index_to_registration (mp->client_index);
  if (regp == 0)
    {
      clib_warning ("API client disconnected");
      return;
    }
  if (regp->registration_type != REGISTRATION_TYPE_SOCKET_SERVER)
    {
      rv = -31;			/* VNET_API_ERROR_INVALID_REGISTRATION */
      goto reply;
    }

  /*
   * Set up a memfd segment of the requested size wherein the
   * shmem data structures will be initialized
   */
  clib_memset (memfd, 0, sizeof (*memfd));
  memfd->ssvm_size = mp->requested_size;
  memfd->requested_va = 0ULL;
  memfd->is_server = 1;
  memfd->name = format (0, "%s%c", regp->name, 0);

  if ((rv = ssvm_server_init_memfd (memfd)))
    goto reply;

  /* Remember to close this fd when the socket connection goes away */
  vec_add1 (regp->additional_fds_to_close, memfd->fd);

  /*
   * Create a plausible svm_region in the memfd backed segment
   */
  clib_memset (a, 0, sizeof (*a));
  a->baseva = memfd->sh->ssvm_va + MMAP_PAGESIZE;
  a->size = memfd->ssvm_size - MMAP_PAGESIZE;
  /* $$$$ might want a different config parameter */
  a->pvt_heap_size = am->api_pvt_heap_size;
  a->flags = SVM_FLAGS_MHEAP;
  svm_region_init_mapped_region (a, (svm_region_t *) a->baseva);

  /*
   * Part deux, initialize the svm_region_t shared-memory header
   * api allocation rings, and so on.
   */
  config = vl_api_make_shm_config (mp);
  vlib_rp = (svm_region_t *) a->baseva;
  vl_init_shmem (vlib_rp, config, 1 /* is_vlib (dont-care) */ ,
		 1 /* is_private */ );

  /* Remember who created this. Needs to be post vl_init_shmem */
  shmem_hdr = (vl_shmem_hdr_t *) vlib_rp->user_ctx;
  shmem_hdr->clib_file_index = vl_api_registration_file_index (regp);

  vec_add1 (am->vlib_private_rps, vlib_rp);
  memfd->sh->ready = 1;
  vec_free (config);

  /* Recompute the set of input queues to poll in memclnt_process */
  vec_reset_length (vl_api_queue_cursizes);

reply:

  rmp = vl_msg_api_alloc (sizeof (*rmp));
  rmp->_vl_msg_id = htons (VL_API_SOCK_INIT_SHM_REPLY);
  rmp->context = mp->context;
  rmp->retval = htonl (rv);

  /*
   * Note: The reply message needs to make it out the back door
   * before we send the magic fd message. That's taken care of by
   * the send function.
   */
  vl_socket_api_send (regp, (u8 *) rmp);

  if (rv != 0)
    return;

  /* Send the magic "here's your sign (aka fd)" socket message */
  cf = vl_api_registration_file (regp);

  /* Wait for reply to be consumed before sending the fd */
  while (tries-- > 0)
    {
      int bytes;
      rv = ioctl (cf->file_descriptor, TIOCOUTQ, &bytes);
      if (rv < 0)
	{
	  clib_unix_warning ("ioctl returned");
	  break;
	}
      if (bytes == 0)
	break;
      usleep (1e3);
    }

  vl_sock_api_send_fd_msg (cf->file_descriptor, &memfd->fd, 1);
}

#define foreach_vlib_api_msg                    	\
  _(SOCKCLNT_CREATE, sockclnt_create, 1)             	\
  _(SOCKCLNT_DELETE, sockclnt_delete, 1)		\
  _(SOCK_INIT_SHM, sock_init_shm, 1)

clib_error_t *
vl_sock_api_init (vlib_main_t * vm)
{
  clib_file_main_t *fm = &file_main;
  clib_file_t template = { 0 };
  vl_api_registration_t *rp;
  socket_main_t *sm = &socket_main;
  clib_socket_t *sock = &sm->socksvr_listen_socket;
  clib_error_t *error;

  /* If not explicitly configured, do not bind/enable, etc. */
  if (sm->socket_name == 0)
    return 0;

#define _(N,n,t)						\
    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
                           vl_api_##n##_t_handler,              \
                           vl_noop_handler,                     \
                           vl_api_##n##_t_endian,               \
                           vl_api_##n##_t_print,                \
                           sizeof(vl_api_##n##_t), t);
  foreach_vlib_api_msg;
#undef _

  vec_resize (sm->input_buffer, 4096);

  sock->config = (char *) sm->socket_name;
  sock->flags = CLIB_SOCKET_F_IS_SERVER | CLIB_SOCKET_F_ALLOW_GROUP_WRITE;
  error = clib_socket_init (sock);
  if (error)
    return error;

  pool_get (sm->registration_pool, rp);
  clib_memset (rp, 0, sizeof (*rp));

  rp->registration_type = REGISTRATION_TYPE_SOCKET_LISTEN;

  template.read_function = socksvr_accept_ready;
  template.write_function = socksvr_bogus_write;
  template.file_descriptor = sock->fd;
  template.private_data = rp - sm->registration_pool;

  rp->clib_file_index = clib_file_add (fm, &template);
  return 0;
}

static clib_error_t *
socket_exit (vlib_main_t * vm)
{
  socket_main_t *sm = &socket_main;
  vl_api_registration_t *rp;

  /* Defensive driving in case something wipes out early */
  if (sm->registration_pool)
    {
      u32 index;
        /* *INDENT-OFF* */
        pool_foreach (rp, sm->registration_pool, ({
          vl_api_registration_del_file (rp);
          index = rp->vl_api_registration_pool_index;
          vl_socket_free_registration_index (index);
        }));
/* *INDENT-ON* */
    }

  return 0;
}

VLIB_MAIN_LOOP_EXIT_FUNCTION (socket_exit);

static clib_error_t *
socksvr_config (vlib_main_t * vm, unformat_input_t * input)
{
  socket_main_t *sm = &socket_main;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "socket-name %s", &sm->socket_name))
	;
      /* DEPRECATE: default keyword is ignored */
      else if (unformat (input, "default"))
	;
      else
	{
	  return clib_error_return (0, "unknown input '%U'",
				    format_unformat_error, input);
	}
    }

  if (!vec_len (sm->socket_name))
    sm->socket_name = format (0, "%s/%s", vlib_unix_get_runtime_dir (),
			      API_SOCKET_FILENAME);
  vec_terminate_c_string (sm->socket_name);

  return 0;
}

VLIB_CONFIG_FUNCTION (socksvr_config, "socksvr");

void
vlibsocket_reference ()
{
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */